A long time ago – longer than I care to remember – I proposed what an economist would call an equilibrium model of imperialism (1). Briefly stated, the argument went as follows:-Imperialism is a response to disparities of power. The very existence of such disparity is an invitation and temptation to exploit it. Not everyone will respond to such invitation, but there will always be some who try to translatepotentialdominion intoactual.-Motivation is secondary: where a disparity of power exists, imperialism will never lack for reasons or justifications. These will vary from the crudest greed or will to dominance to the loftiest altruism.-To understand the timing and extent of imperialist dominions, therefore, it is more important to study the character and distribution of power than the incentives to its exercise.